Halftone effect in Photoshop can be created in different ways each method having its own particularities. The most commonly used is the Halftone Pattern Filter that you can find uder the Filter>Sketch menu. This method will transform your photo into a halftone patterned image that uses your background and foreground colors. The halftone pattern types available are dot, circle and line with different size and contrast variations.
The second method to create halftone effects in Photoshop, uses the Bitmap Photoshop option that ou can find under the Image>Mode menu. You must turn your image into a Grayscale mode first. From the Bitmap choose the method Halftone Screen.
The third method is the Color Halftone filter that you can find under Filter>Pixelate menu. You will obtain a colored image with a dot halftone pattern with different setting options. Of course that you can obtain creative halftone effects using halftone brushes/textures/patterns.
Halftone Pattern Photoshop Guide for Beginners
Halftone Photoshop Shape and Brushes
In this tutorial we will explore Photoshop's bitmap and halftone tools and effects. Much of this tutorial will be based on experimenting with the various halftone bitmap options and finding out what works best for you.
Halftone and bitmap effect photoshop tutorial
Halftone Tutorial Photoshop Guide
Halftone pattern photo border in Photoshop
In Photoshop you can create halftone effects (like the background of the type behind the word halftone in the image above) in just a few steps with the help of the Bitmap Image Mode. This Halftone Screen effect is very popular because it confuses and mesmerizes your eyes if used with enough contrast.
Halftone Text Effect in Photoshop
Comics Text in Photoshop with Halftone Pattern
Photoshop halftone effect
Photoshop Poster with Halftone Pattern
Board Game Text with Halftone Pattern in Photoshop
Roy Lichtenstein Effect with Halftone Pattern in Photoshop
Abstract Wallpaper using Halftone Texture
Money Photo Effect in Photoshop with Halftone Pattern
The halftone effect is used in comics, in pop art and other illustrations.